[Bug 107864] Specific Shadertoy demo renders garbage in empty parts of target surface

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107864

            Bug ID: 107864
           Summary: Specific Shadertoy demo renders garbage in empty parts
                    of target surface
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: kode54 at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

The following Shadertoy demo:

https://www.shadertoy.com/view/Xt3cWS

renders garbage in the top and bottom strips of the target surface, which
appears to be uninitialized VRAM being copied to the display surface.

It does not appear to matter which WebGL capable browser I use to run the demo,
they all replicate the issue on my RX480.

I cannot get apitrace to run on Firefox without that particular page crashing
on load, and I cannot get RenderDoc to attach to the tab's process and actually
capture anything.

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